bottle: add: improve regexp to recognize comments

This would have eliminated the need for Homebrew/homebrew-core#9000, for
instance.

Library/Homebrew/dev-cmd/bottle.rb

@@ -435,6 +435,7 @@ module Homebrew
             else
               string = s.sub!(
                 /(
+                  (\ {2}\#[^\n]*\n)*                                             # comments
                   \ {2}(                                                         # two spaces at the beginning
                     (url|head)\ ['"][\S\ ]+['"]                                  # url or head with a string
                     (